American fern journal - American Fern Society. (American Fern Society, 1910)

American fern journal - American Fern Society. (American Fern Society, 1913)

American fern journal - American Fern Society. (American Fern Society, 1914)

American fern journal - American Fern Society. (American Fern Society, 1915)

American fern journal - American Fern Society. (American Fern Society, 1917)

American fern journal - American Fern Society. (American Fern Society, 1919)

American fern journal - American Fern Society. (American Fern Society, 1922)

American fern journal - American Fern Society. (American Fern Society, 1925)